Editor’s Choice: CMMG 5.7 mm Conversion Kit

by
posted on May 19, 2020
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
cmmgkit.jpg

CMMG has tapped into a cartridge that has long been a niche round for a select few enthusiasts: the 5.7x28 mm FN. The cartridge underwent a recent resurgence with the launch of the CMMG Mk57 Banshee in 2019 and received a bigger boost with the 2020 launch of the Ruger-57.

Now CMMG proves that it wasn’t finished with the 5.7 mm by rolling out a conversion kit for today’s AR-15 rifle owners. The Mk57 Banshee fed from Five-SeveN magazines, requiring added investment for anyone not already sitting on a stock of them.

However, the Mk57 AR Conversion Kit provides an opportunity for owners of mil-spec AR-15 lower receivers to get in on the 5.7 mm fun. The conversion 
includes a STANAG-size magazine that provides a reliable feeding platform for the company’s 5.7x28 mm FN upper receiver.

Best of all, these proprietary magazines hold 40 rounds each, providing twice the capacity of FN Five-SeveN pistol magazines. For more information on these CMMG 5.7 Conversion Kits, visit
cmmginc.com.

Latest

Star Model B Ihtog 1
Star Model B Ihtog 1

I Have This Old Gun: Star Model B

Of the many Spanish-made firearms to emerge throughout the 19th and 20th century, one of the most recognizable is the Star Model B, largely due to its similarity to the Colt Model 1911.

New For 2025: Kimber Next Generation 1911

For its latest M1911 offering, Kimber Mfg. borrowed design elements from its double-stack 2K11 pistol to create what it calls the Next Generation 1911.

Review: Charter Arms Double Dog

Charter Arms is an American gunmaker that has offered its own versions of compact, double-action revolvers at fair prices for more than 60 years.

Rifleman Q&A: Mysterious “Broomhandle” Bring-Back

"My favorite gun is inoperable, so I have not shot it. It is one of two weapons that my dad brought back from the Philippines after World War II, the other being a sword."

New Jersey Town Supports CCW With Fee Refund

The city of Englishtown, N.J., recently made a move to reduce that financial barrier, sparking widespread optimism that a statewide, even nationwide, trend may be on the horizon.

Review: Savage Arms Revel

Lever-action rifles have experienced a revival in recent years, and Savage Arms is getting in on the act with its Revel series rimfires. To understand it, you may have to read (backward) between the lines.

Interests



Get the best of American Rifleman delivered to your inbox.